National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaRiver Group: San Joaquin
Monitor Stage: N/A Flood Stage: 8.0 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2019
4,240
7.79
Jun 13, 2019
2018
8,060
10.09
Apr 7, 2018
2017
5,210
8.45
Jun 20, 2017
2016
2,490
6.30
May 14, 2016
2015
882
4.25
Feb 9, 2015
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present)
1997
10,100
13.27
Jan 2, 1997
1956
9,840
12.73
Dec 23, 1955
1951
9,260
11.55
Nov 18, 1950
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ192)
Today: Sunny. Highs 71 to 81 at 5000 feet and 62 to 72 at 8000 feet.

Tonight: Mostly clear. Lows 50 to 60 at 5000 feet and 41 to 51 at 8000 feet.

Friday: Sunny. Highs 74 to 84 at 5000 feet and 64 to 74 at 8000 feet.

Friday Night: Mostly clear. Lows 53 to 63 at 5000 feet and 44 to 53 at 8000 feet.

Saturday: Sunny. Highs 78 to 88 at 5000 feet and 68 to 76 at 8000 feet.

Saturday Night through Tuesday Night: Mostly clear. Lows 56 to 66 at 5000 feet and 46 to 56 at 8000 feet. Highs 80 to 90 at 5000 feet and 68 to 78 at 8000 feet.

Wednesday: Sunny. Highs 78 to 86 at 5000 feet and 65 to 75 at 8000 feet.
Impacts - E19 Information
7.0 FeetCampgrounds at North Pines and Housekeeping Camp begin to flood.
9.5 FeetSubstantial road flooding occurs at Sentinel Crossover, Wosky Pond, and Chapel Meadow. Water is approximately one foot deep on the road through Chapel Meadow.
10.0 FeetNorthside and Southside Drive are impassable to vehicles. Water comes 1.5 feet up the side of the Yosemite Creek Lift Station and 1 to 2 inches above the foundation of pumps that control the Housekeeping Camp Lift Station. Water flows two feet over the "swinging bridge".
13.27 FeetFlood of record - January 2, 1997.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Joaquin Valley-Hanford Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.